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(KMOV) -- A man who attended Parkway Central High School was among six U.S. troops who were killed Tuesday when their Blackhawk helicopter made a hard landing in southern Afghanistan and then came under attack by insurgents.

Joseph Silverman, 35, a chief warrant officer, died from his injuries. It was not immediately clear whether Silverman and five others in the Black Hawk UH-60 helicopter died in the hard landing or in the subsequent attack on their position.

One person on board the aircraft was injured and survived, two U.S. defense officials said on condition of anonymity because they were not authorized to speak on the record.

Silverman and his family moved from Chesterfield to Arizona when he was in high school. He was based at Fort Riley, Kans.

A statement issued by the NATO international military coalition said the crash was under investigation and that there was no insurgent activity in the area. In Washington, an official originally said the helicopter had experienced engine failure before the crash, but later said that it was unclear whether that was the case.

The U.S.-led international military coalition confirmed the deadly crash but said there were no initial reports of fighting or insurgent activity in the area at the time.